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Lindcott Armory

Rifle · Obsolete

.375 LSR

Also known as 375 LSR · .375 Long School Record

British long-range target cartridge.

Caliber
0.375″ · 9.525 mm
Introduced
1900
Case
Rimmed
Primary use
target
Status
Obsolete

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VelocityBeing verified
EnergyBeing verified
Typical grains200 · 300 · 350 gr
Identity
Introduced
1900
Type
Rifle
Origin
United Kingdom
Manufacturer
Various
Standard
Obsolete
Status
Obsolete
Availability
Antique
Build
Case capacity
90 gr H₂O
Twist (typical)
1:12
Primer
Large Rifle
Case type
Rimmed
Pressure & range
Max pressure
25,000 psi
Eff. range
300 yd
Recoil
12–18 ft·lb
Subsonic
Capable

Ballistics

Published velocity/energy data isn't available for .375 LSR — an obsolete/collector cartridge.

Performance

Best for Withheld until verified
Best for Withheld until verified
Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

mixed/other · approximate
Measuremmin✓
Bullet ⌀ 9.530.375 ~
Neck ⌀ ——
Shoulder ⌀ n/a
Shoulder angle n/a
Base ⌀ ——
Rim ⌀ ——
Belt ⌀ n/a
Rim thickness ——
Neck length n/a
Case length ——
Overall length ——

Missing a dimension for .375 LSR? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Reloading costestimate cost per round vs factory

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Connected reference

Loads19 factory loads for .375 LSRFirearmsFirearms in .375 LSR

History

A specialized proprietary cartridge from the late 19th century, developed for a specific long-range sporting rifle system. Used in single-shot target rifles for 1,000-yard competition. Represents the era of highly specialized target cartridges before .308 Winchester standardized long-range competition.

FAQs

What twist rate does .375 LSR use?
.375 LSR typically uses a 1:12 twist rate.
What bullet diameter is .375 LSR?
.375 LSR uses a 0.375″ (9.525 mm) diameter bullet.
Is .375 LSR still in production?
.375 LSR is obsolete; typical availability is antique.
What is .375 LSR used for?
.375 LSR is primarily used for target.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 19 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →